Pop quiz: What causes an estimated 21,000 lung cancer deaths every year in the United States?
Hint: It isn't cigarette smoke. The correct answer is radon, an odorless radioactive gas that seeps into homes from the earth.
Now the Environmental Protection Agency is reporting that 1 out of 15 homes across the nation has indoor radon levels that warrant action, defined as 4 or more picocuries per liter of air. Even if you had your home tested when you moved in, radon levels can fluctuate over time.
Consider retesting now and again every few years—test kits cost about $30 at home improvement stores. If your home's level is high, a radon service contractor can pinpoint the source and install a mitigation system. Granted, this service doesn't come cheap (about $600 and up), but the investment will pay off—for your health and your home's resale value.